Tip: scan the parts

Before you start building laser cut structure scan all the parts you can. If later on you mess up one trace the scan over in CAD or photo editing software, print a template, and cut out new part. Or simply just print the scan if such software isn't available.
Copy machine may be an option. However, rumors are that they are set to distort a copy so that people don't start copying money. Check yours before you copy whole batch.
In a worst case just trace biggest parts over on a piece of paper. It is always better than nothing.